Ce(IV)/Ce(III) redox cycle triggers hydroxyl radical production on the CeOx/carbon black flow-anode for electro-oxidation of acetaminophen

被引：1

作者：

Jin, Huachang ^{[1
,4
]}

Xu, Xiaozhi ^{[1
]}

Liu, Renlan ^{[1
]}

Wu, Xiaobo ^{[5
]}

Chen, Xueming ^{[3
]}

Zheng, Xiangyong ^{[1
]}

Zhao, Min ^{[1
]}

Yu, Yang ^{[2
]}

机构：

[1] Wenzhou Univ, Coll Life & Environm Sci, Natl & Local Joint Engn Res Ctr Ecol Treatment Tec, Wenzhou 325035, Zhejiang, Peoples R China

[2] Zhejiang Ocean Univ, Natl & Local Joint Engn Res Ctr Harbor Oil & Gas S, Zhejiang Key Lab Petrochem Environm Pollut Control, Zhoushan 316022, Zhejiang, Peoples R China

[3] Zhejiang Univ, Coll Environm & Resources Sci, 866 Yuhangtang Rd, Hangzhou 310058, Peoples R China

[4] Wenzhou Univ, Inst Ecoenvironm Res Sanyang Wetland, Wenzhou 325035, Zhejiang, Peoples R China

[5] Ecol Environm Protect Adm Law Enforcement Team Rui, Wenzhou 325035, Zhejiang, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 483卷

基金：

中国国家自然科学基金;

关键词：

Electro-oxidation; Acetaminophen; Ce(IV)/Ce(III) redox cycle; Hydroxyl radicals; CeO x /CB flow-anode; ENHANCED ELECTROCATALYTIC REMOVAL; DYEING WASTE-WATER; ELECTROCHEMICAL DEGRADATION; ELECTRODES; OXIDATION; KINETICS; PARTICLES;

D O I：

10.1016/j.cej.2024.149195

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Electrochemically active materials can effectively alleviate mass transfer restriction by adding them as flowanodes into the electrochemical reactor. However, conventional flow-anode materials display a low center dot OH yield. Here, a novel flow-anode, CeOx/carbon black (CB), demonstrates superior electrocatalytic degradation efficiency of organic pollutants. The acetaminophen degradation kinetic constant of CeOx/CB was calculated to be 2.3-2.9 times higher than that of CB. CeOx/CB achieved a higher current efficiency of 66.4 % and relatively lower energy consumption of 157.8 kWh/kg COD compared with other GAC or gamma-Al2O3-based flow-anodes. The mechanistic analyses demonstrated that rapid electron transfer, strong water adsorption, and low reaction energy barrier of CeOx/CB actuated efficient center dot OH generation. Moreover, Ce(IV)/Ce(III) redox cycle crucially acted as an "electron porter" to accelerate the electron transfer from adsorbed H2O molecules to CB substrate directionally in the electro-oxidation process. This work provides a feasible manner for the development of flow-anodes utilizing the advantage of the Ce(IV)/Ce(III) redox cycle.

引用

页数：10